题目

--Jack's never worked hard at English, _______?-- _______ , so he can't answer the question in English, I think.A．is he; Yes, he isB．is he; No, he isn'tC．has he; Yes, he hasD．has he; No, he hasn't 答案：D解析:Jack’s此处为Jack has的缩写，因句中有never，故附加问句应用has；答句说明的是否定情况，故应用N0，he hasn’t。

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